Immune complex-mediated renal involvement in relapsing polychondritis

Area of Science:

• Nephrology
• Rheumatology
• Immunology

Background:

• Relapsing polychondritis (RP) is a rare systemic autoimmune disease characterized by progressive destruction of cartilaginous structures.
• Glomerulonephritis (GN), particularly crescentic GN, is an uncommon but serious renal manifestation of RP.

Observation:

• This report details a patient with relapsing polychondritis who developed rapidly progressive glomerulonephritis.
• Renal biopsy revealed crescentic glomerulonephritis, indicating severe kidney damage.

Findings:

• Immunologic mechanisms are implicated, evidenced by circulating immune complexes, immunoglobulin, and complement deposition in the kidney.
• Electron microscopy confirmed electron-dense deposits, further supporting immune-mediated pathogenesis.

Implications:

• This case adds to the limited literature associating RP with crescentic GN.
• Prompt immunosuppressive therapy, including prednisone and dapsone, may lead to favorable outcomes in RP-associated GN.